UEFI or BIOS? The easiest way to find out if the system has booted in UEFI or BIOS mode is to look for a folder /sys/firmware/efi. I have tested this GRUB reinstallation on Ubuntu Linux, though all of the commands below should work for the other Linux systems as well.Ĭool Tip: How to create a Linux rescue USB stick! Read more → Reinstall GRUB from Live USB ![]() In this note i am describing a particular case of how to repair GRUB by reinstalling it from a live USB if a broken system is configured to boot in UEFI mode and a system’s disk is partitioned to LVM. There are many reasons why you may need to reinstall GRUB: corrupted boot partition GRUB got overridden after Windows installation some unsupported Linux kernel parameters have been set in a GRUB configuration file and the system is not booting anymore but this can’t be fixed from a GRUB menu as it is not showing up, etc.
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